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      <title>CVE-2021-41267 — Webcache Poisoning in Symfony</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-41267</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; symfony&lt;/p&gt;
&lt;p&gt;Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the &amp;#34;trusted_headers&amp;#34; allowed list are ignored and protect users from &amp;#34;Cache poisoning&amp;#34; attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the &amp;#34;trusted_headers&amp;#34; allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; symfony&lt;/p&gt;
&lt;p&gt;Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the &amp;#34;trusted_headers&amp;#34; allowed list are ignored and protect users from &amp;#34;Cache poisoning&amp;#34; attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the &amp;#34;trusted_headers&amp;#34; allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted.&lt;/p&gt;</content:encoded>
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